The TVR-2160C Stack Quad Coupler is an adapter that was added in version 0.21 in KSP. The Quad Coupler is useful in some ways, tying with the TVR-400L Stack Quad-Adapter for the part with the most nodes. It is typically used to separate a single size 1 (1.25 meter) stack into four separate stacks. It supports fuel crossfeed.

The quadcoupler has non-standard (0.3 instead of 0.2) drag, meaning it should be placed behind the center of mass to ensure stability. Given its intended function, this can be problematic.

Product description

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What could be more awesome than a Tricoupler? Why, a quadcoupler, of course. Just remember that this is not a decoupler, and will not separate stages.